diff --git a/src/hs.cpp b/src/hs.cpp
index 303e7838..73cc032f 100644
--- a/src/hs.cpp
+++ b/src/hs.cpp
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2015-2020, Intel Corporation
+ * Copyright (c) 2015-2021, Intel Corporation
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are met:
@@ -517,6 +517,12 @@ hs_error_t hs_expression_info_int(const char *expression, unsigned int flags,
         return HS_COMPILER_ERROR;
     }
 
+    if (flags & HS_FLAG_COMBINATION) {
+        *error = generateCompileError("Invalid parameter: unsupported "
+                                      "logical combination expression", -1);
+        return HS_COMPILER_ERROR;
+    }
+
     *info = nullptr;
     *error = nullptr;
 
diff --git a/src/hs_compile.h b/src/hs_compile.h
index b318c29d..5aa24188 100644
--- a/src/hs_compile.h
+++ b/src/hs_compile.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2015-2020, Intel Corporation
+ * Copyright (c) 2015-2021, Intel Corporation
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are met:
@@ -748,10 +748,7 @@ hs_error_t HS_CDECL hs_free_compile_error(hs_compile_error_t *error);
  *       - HS_FLAG_PREFILTER - Compile pattern in prefiltering mode.
  *       - HS_FLAG_SOM_LEFTMOST - Report the leftmost start of match offset
  *                                when a match is found.
- *       - HS_FLAG_COMBINATION - Parse the expression in logical combination
- *                               syntax.
- *       - HS_FLAG_QUIET - Ignore match reporting for this expression. Used for
- *                         the sub-expressions in logical combinations.
+ *       - HS_FLAG_QUIET - This flag will be ignored.
  *
  * @param info
  *      On success, a pointer to the pattern information will be returned in
@@ -814,10 +811,7 @@ hs_error_t HS_CDECL hs_expression_info(const char *expression,
  *       - HS_FLAG_PREFILTER - Compile pattern in prefiltering mode.
  *       - HS_FLAG_SOM_LEFTMOST - Report the leftmost start of match offset
  *                                when a match is found.
- *       - HS_FLAG_COMBINATION - Parse the expression in logical combination
- *                               syntax.
- *       - HS_FLAG_QUIET - Ignore match reporting for this expression. Used for
- *                         the sub-expressions in logical combinations.
+ *       - HS_FLAG_QUIET - This flag will be ignored.
  *
  * @param ext
  *      A pointer to a filled @ref hs_expr_ext_t structure that defines
diff --git a/src/hs_internal.h b/src/hs_internal.h
index adf07b22..4eb5e157 100644
--- a/src/hs_internal.h
+++ b/src/hs_internal.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2019, Intel Corporation
+ * Copyright (c) 2019-2021, Intel Corporation
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are met:
@@ -80,7 +80,9 @@ extern "C"
                     | HS_FLAG_PREFILTER \
                     | HS_FLAG_SINGLEMATCH \
                     | HS_FLAG_ALLOWEMPTY \
-                    | HS_FLAG_SOM_LEFTMOST)
+                    | HS_FLAG_SOM_LEFTMOST \
+                    | HS_FLAG_COMBINATION \
+                    | HS_FLAG_QUIET)
 
 #ifdef __cplusplus
 } /* extern "C" */