fix English grammar
diff --git a/src/event/ngx_event_busy_lock.c b/src/event/ngx_event_busy_lock.c
index c5cecc3..249e205 100644
--- a/src/event/ngx_event_busy_lock.c
+++ b/src/event/ngx_event_busy_lock.c
@@ -9,7 +9,7 @@
 #include <ngx_event.h>
 
 
-static ngx_int_t ngx_event_busy_lock_look_cachable(ngx_event_busy_lock_t *bl,
+static ngx_int_t ngx_event_busy_lock_look_cacheable(ngx_event_busy_lock_t *bl,
     ngx_event_busy_lock_ctx_t *ctx);
 static void ngx_event_busy_lock_handler(ngx_event_t *ev);
 static void ngx_event_busy_lock_posted_handler(ngx_event_t *ev);
@@ -65,14 +65,14 @@
 
 
 ngx_int_t
-ngx_event_busy_lock_cachable(ngx_event_busy_lock_t *bl,
+ngx_event_busy_lock_cacheable(ngx_event_busy_lock_t *bl,
     ngx_event_busy_lock_ctx_t *ctx)
 {
     ngx_int_t  rc;
 
     ngx_mutex_lock(bl->mutex);
 
-    rc = ngx_event_busy_lock_look_cachable(bl, ctx);
+    rc = ngx_event_busy_lock_look_cacheable(bl, ctx);
 
     ngx_log_debug3(NGX_LOG_DEBUG_EVENT, ctx->event->log, 0,
                    "event busy lock: %d w:%d mw:%d",
@@ -201,14 +201,14 @@
 
 
 static ngx_int_t
-ngx_event_busy_lock_look_cachable(ngx_event_busy_lock_t *bl,
+ngx_event_busy_lock_look_cacheable(ngx_event_busy_lock_t *bl,
     ngx_event_busy_lock_ctx_t *ctx)
 {
     ngx_int_t    free;
-    ngx_uint_t   i, bit, cachable, mask;
+    ngx_uint_t   i, bit, cacheable, mask;
 
     bit = 0;
-    cachable = 0;
+    cacheable = 0;
     free = -1;
 
 #if (NGX_SUPPRESS_WARN)
@@ -227,14 +227,14 @@
                 ctx->slot = i;
                 return NGX_AGAIN;
             }
-            cachable++;
+            cacheable++;
 
         } else if (free == -1) {
             free = i;
         }
 
-        if (cachable == bl->cachable) {
-            if (free == -1 && cachable < bl->max_busy) {
+        if (cacheable == bl->cacheable) {
+            if (free == -1 && cacheable < bl->max_busy) {
                 free = i + 1;
             }
 
@@ -259,7 +259,7 @@
     bl->md5_mask[free / 8] |= 1 << (free & 7);
     ctx->slot = free;
 
-    bl->cachable++;
+    bl->cacheable++;
     bl->busy++;
 
     return NGX_OK;
diff --git a/src/event/ngx_event_busy_lock.h b/src/event/ngx_event_busy_lock.h
index 5b50be6..3e76770 100644
--- a/src/event/ngx_event_busy_lock.h
+++ b/src/event/ngx_event_busy_lock.h
@@ -34,7 +34,7 @@
 typedef struct {
     u_char                     *md5_mask;
     char                       *md5;
-    ngx_uint_t                  cachable;
+    ngx_uint_t                  cacheable;
 
     ngx_uint_t                  busy;
     ngx_uint_t                  max_busy;
@@ -53,7 +53,7 @@
 
 ngx_int_t ngx_event_busy_lock(ngx_event_busy_lock_t *bl,
     ngx_event_busy_lock_ctx_t *ctx);
-ngx_int_t ngx_event_busy_lock_cachable(ngx_event_busy_lock_t *bl,
+ngx_int_t ngx_event_busy_lock_cacheable(ngx_event_busy_lock_t *bl,
     ngx_event_busy_lock_ctx_t *ctx);
 void ngx_event_busy_unlock(ngx_event_busy_lock_t *bl,
     ngx_event_busy_lock_ctx_t *ctx);
diff --git a/src/event/ngx_event_pipe.c b/src/event/ngx_event_pipe.c
index 31efc03..4d52b7b 100644
--- a/src/event/ngx_event_pipe.c
+++ b/src/event/ngx_event_pipe.c
@@ -192,7 +192,7 @@
                 chain->buf = b;
                 chain->next = NULL;
 
-            } else if (!p->cachable
+            } else if (!p->cacheable
                        && p->downstream->data == p->output_ctx
                        && p->downstream->write->ready
                        && !p->downstream->write->delayed)
@@ -209,7 +209,7 @@
 
                 break;
 
-            } else if (p->cachable
+            } else if (p->cacheable
                        || p->temp_file->offset < p->max_temp_file_size)
             {
 
@@ -406,7 +406,7 @@
         }
     }
 
-    if (p->cachable && p->in) {
+    if (p->cacheable && p->in) {
         if (ngx_event_pipe_write_chain_to_temp_file(p) == NGX_ABORT) {
             return NGX_ABORT;
         }
@@ -542,7 +542,7 @@
 
                 ngx_event_pipe_free_shadow_raw_buf(&p->free_raw_bufs, cl->buf);
 
-            } else if (!p->cachable && p->in) {
+            } else if (!p->cacheable && p->in) {
                 cl = p->in;
 
                 ngx_log_debug3(NGX_LOG_DEBUG_EVENT, p->log, 0,
@@ -612,7 +612,7 @@
         for (cl = p->free; cl; cl = cl->next) {
 
             if (cl->buf->temp_file) {
-                if (p->cachable || !p->cyclic_temp_file) {
+                if (p->cacheable || !p->cyclic_temp_file) {
                     continue;
                 }
 
@@ -659,7 +659,7 @@
         out = p->in;
     }
 
-    if (!p->cachable) {
+    if (!p->cacheable) {
 
         size = 0;
         cl = out;
diff --git a/src/event/ngx_event_pipe.h b/src/event/ngx_event_pipe.h
index 887f8b7..f9b3d51 100644
--- a/src/event/ngx_event_pipe.h
+++ b/src/event/ngx_event_pipe.h
@@ -47,7 +47,7 @@
     void                             *output_ctx;
 
     unsigned           read:1;
-    unsigned           cachable:1;
+    unsigned           cacheable:1;
     unsigned           single_buf:1;
     unsigned           free_bufs:1;
     unsigned           upstream_done:1;