diff --git a/configs/viewtool-stm32f107/README.txt b/configs/viewtool-stm32f107/README.txt
index 5964609c17..eb65052884 100644
--- a/configs/viewtool-stm32f107/README.txt
+++ b/configs/viewtool-stm32f107/README.txt
@@ -540,6 +540,12 @@ Configurations
     6. USB support is disabled by default.  See the section above entitled,
        "USB Interface"
 
+    STATUS.  The first time I build the configuration, I get some undefined
+    external references.  No idea why.  Simply cleaning the apps/ directory
+    and rebuilding fixes the problem:
+
+      make apps_clean all
+
   nsh:
 
     This configuration directory provide the basic NuttShell (NSH).
diff --git a/drivers/sercomm/README.txt b/drivers/sercomm/README.txt
index a9239a2041..06add26e88 100644
--- a/drivers/sercomm/README.txt
+++ b/drivers/sercomm/README.txt
@@ -15,5 +15,5 @@ at same level as the nuttx project:
   `- osmocom-bb
 
 If you attempt to build this driver without osmocom-bb, you will get
-compilation errors  because ofheader files that are needed from the
+compilation errors because of header files that are needed from the
 osmocom-bb directory.