diff --git a/CMakeLists.txt b/CMakeLists.txt
index bd9430fc..5494a5e6 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -626,7 +626,7 @@ if (LWS_WITH_SSL)
 
 		# Additional to the root directory we need to include
 		# the wolfssl/ subdirectory which contains the OpenSSL
-		# compatability layer headers.
+		# compatibility layer headers.
 
 		if (LWS_USE_CYASSL)
 			foreach(inc ${WOLFSSL_INCLUDE_DIRS})
diff --git a/changelog b/changelog
index 62f1ca50..eb41a60d 100644
--- a/changelog
+++ b/changelog
@@ -97,7 +97,7 @@ User api removal
 ----------------
 
 protocols struct member no_buffer_all_partial_tx is removed.  Under some
-conditions like rewriting extention such as compression in use, the built-in
+conditions like rewriting extension such as compression in use, the built-in
 partial send buffering is the only way to deal with the problem, so turning
 it off is deprecated.
 
@@ -348,7 +348,7 @@ User api additions
 
  - if your OS does not support the http_proxy environment variable convention
  	(eg, reportedly OSX), you can use a new api libwebsocket_set_proxy()
- 	to set the proxy details inbetween context creation and the connection
+ 	to set the proxy details in between context creation and the connection
  	action.  For OSes that support http_proxy, that's used automatically.
 
 User api changes
diff --git a/lib/libwebsockets.h b/lib/libwebsockets.h
index 851c38d7..22ae6f9a 100644
--- a/lib/libwebsockets.h
+++ b/lib/libwebsockets.h
@@ -1429,7 +1429,7 @@ LWS_VISIBLE LWS_EXTERN size_t
 libwebsockets_remaining_packet_payload(struct libwebsocket *wsi);
 
 /*
- * if the protocol does not have any guidence, returns -1.  Currently only
+ * if the protocol does not have any guidance, returns -1.  Currently only
  * http2 connections get send window information from this API.  But your code
  * should use it so it can work properly with any protocol.
  * 
diff --git a/lib/private-libwebsockets.h b/lib/private-libwebsockets.h
index 0f4d051c..ef8871fb 100644
--- a/lib/private-libwebsockets.h
+++ b/lib/private-libwebsockets.h
@@ -623,7 +623,7 @@ struct lws_fragments {
  * all have a pointer to allocated_headers struct as their first member.
  * 
  * It means for allocated_headers access, the three union paths can all be
- * used interchangably to access the same data
+ * used interchangeably to access the same data
  */
 
 struct allocated_headers {