diff --git a/src/p_acs.cpp b/src/p_acs.cpp
index b5233bb70..ecaecd2c9 100644
--- a/src/p_acs.cpp
+++ b/src/p_acs.cpp
@@ -217,7 +217,7 @@ FWorldGlobalArray ACS_GlobalArrays[NUM_GLOBALVARS];
 //
 // When the string table needs to grow to hold more strings, a garbage
 // collection is first attempted to see if more room can be made to store
-// strings without growing. A string is concidered in use if any value
+// strings without growing. A string is considered in use if any value
 // in any of these variable blocks contains a valid ID in the global string
 // table:
 //   * The active area of the ACS stack
@@ -226,7 +226,7 @@ FWorldGlobalArray ACS_GlobalArrays[NUM_GLOBALVARS];
 //   * All world variables
 //   * All global variables
 // It's not important whether or not they are really used as strings, only
-// that they might be. A string is also concidered in use if its lock count
+// that they might be. A string is also considered in use if its lock count
 // is non-zero, even if none of the above variable blocks referenced it.
 //
 // To keep track of local and map variables for nonresident maps in a hub,