diff --git a/doc/src/sgml/ecpg.sgml b/doc/src/sgml/ecpg.sgml
index 9e401091666..f0fe909dea7 100644
--- a/doc/src/sgml/ecpg.sgml
+++ b/doc/src/sgml/ecpg.sgml
@@ -3582,7 +3582,8 @@ risnull(CINTTYPE, (char *) &i);
       <term><literal>ECPG_INFORMIX_DATE_CONVERT</></term>
       <listitem>
        <para>
-	Functions return this value if Internally it is defined to -1210 (the
+	Functions return this value if an error occurred during date
+	formatting.  Internally it is defined to -1210 (the
 	<productname>Informix</productname> definition).
        </para>
       </listitem>
@@ -3592,7 +3593,8 @@ risnull(CINTTYPE, (char *) &amp;i);
       <term><literal>ECPG_INFORMIX_OUT_OF_MEMORY</></term>
       <listitem>
        <para>
-	Functions return this value if Internally it is defined to -1211 (the
+	Functions return this value if memory was exhausted during
+	their operation.  Internally it is defined to -1211 (the
 	<productname>Informix</productname> definition).
        </para>
       </listitem>