diff --git a/ogma-core/CHANGELOG.md b/ogma-core/CHANGELOG.md
index c418e182..22f37fcd 100644
--- a/ogma-core/CHANGELOG.md
+++ b/ogma-core/CHANGELOG.md
@@ -2,6 +2,8 @@
 
 ## [1.X.Y] - 2026-08-20
 
+* Fix `mergeSpecs` dropping first spec's external variables (#551).
+* Fix spelling of "cannot" in `Command.Standalone` (#551).
 * Replace adhoc function `mergeMaybe` with function from `base` (#516).
 * Fix malformed comments (#518).
 * Remove unnecessary line breaks (#520).
diff --git a/ogma-core/src/Command/Common.hs b/ogma-core/src/Command/Common.hs
index d6999d53..8825baf4 100644
--- a/ogma-core/src/Command/Common.hs
+++ b/ogma-core/src/Command/Common.hs
@@ -98,7 +98,7 @@ combineInputFiles xs
     mergeSpecs :: Spec a -> Spec a -> Spec a
     mergeSpecs s1 s2 = Spec
       { internalVariables = internalVariables s1 ++ internalVariables s2
-      , externalVariables = externalVariables s2 ++ externalVariables s2
+      , externalVariables = externalVariables s1 ++ externalVariables s2
       , requirements      = requirements s1 ++ requirements s2
       }
 
diff --git a/ogma-core/src/Command/Standalone.hs b/ogma-core/src/Command/Standalone.hs
index 834fff2e..c208f590 100644
--- a/ogma-core/src/Command/Standalone.hs
+++ b/ogma-core/src/Command/Standalone.hs
@@ -253,7 +253,7 @@ commandIncorrectSpecF e =
     ErrorTriplet ecIncorrectSpec msg LocationNothing
   where
     msg =
-      "The input specification(s) canbot be formalized: " ++ e
+      "The input specification(s) cannot be formalized: " ++ e
 
 -- | Error message associated to not being able to formalize the input spec.
 commandIncorrectSpecE :: String -> String -> ErrorTriplet