diff --git a/activation.cpp b/activation.cpp
index 298728719a..7c07d5e1bb 100644
--- a/activation.cpp
+++ b/activation.cpp
@@ -414,7 +414,7 @@ Client *Workspace::clientUnderMouse(int screen) const
         }
 
         // rule out clients which are not really visible.
-        // the screen test is rather superflous for xrandr & twinview since the geometry would differ -> TODO: might be dropped
+        // the screen test is rather superfluous for xrandr & twinview since the geometry would differ -> TODO: might be dropped
         if (!(client->isShown(false) && client->isOnCurrentDesktop() &&
                 client->isOnCurrentActivity() && client->isOnScreen(screen)))
             continue;
diff --git a/composite.cpp b/composite.cpp
index 12bb75a8df..c65716b5ca 100644
--- a/composite.cpp
+++ b/composite.cpp
@@ -181,7 +181,7 @@ void Workspace::slotCompositingOptionsInitialized()
         fpsInterval = qMax((fpsInterval / vBlankInterval) * vBlankInterval, vBlankInterval);
     } else
         vBlankInterval = 1 << 10; // no sync - DO NOT set "0", would cause div-by-zero segfaults.
-    m_timeSinceLastVBlank = fpsInterval - 1; // means "start now" - we dont't have even a slight idea when the first vsync will occur
+    m_timeSinceLastVBlank = fpsInterval - 1; // means "start now" - we don't have even a slight idea when the first vsync will occur
     checkCompositeTimer();
     XCompositeRedirectSubwindows(display(), rootWindow(), CompositeRedirectManual);
     new EffectsHandlerImpl(scene->compositingType());   // sets also the 'effects' pointer
diff --git a/scene_opengl_glx.cpp b/scene_opengl_glx.cpp
index b016bba932..e0654b5861 100644
--- a/scene_opengl_glx.cpp
+++ b/scene_opengl_glx.cpp
@@ -633,7 +633,7 @@ void SceneOpenGL::screenGeometryChanged(const QSize &size)
         m_overlayWindow->setup(buffer);
         XSync(display(), false);  // ensure X11 stuff has applied ////
         glXMakeCurrent(display(), glxbuffer, ctxbuffer); // reactivate context ////
-        glViewport(0,0, size.width(), size.height()); // adjust viewport last - should btw. be superflous on the Pixmap buffer - iirc glXCreatePixmap sets the context anyway. ////
+        glViewport(0,0, size.width(), size.height()); // adjust viewport last - should btw. be superfluous on the Pixmap buffer - iirc glXCreatePixmap sets the context anyway. ////
     }
     ShaderManager::instance()->resetAllShaders();
     m_resetModelViewProjectionMatrix = true;
diff --git a/tabgroup.cpp b/tabgroup.cpp
index 771d789954..b3a51d6123 100644
--- a/tabgroup.cpp
+++ b/tabgroup.cpp
@@ -276,7 +276,7 @@ void TabGroup::updateMinMaxSize()
         m_maxSize = m_maxSize.boundedTo((*i)->maxSize());
     }
 
-    // TODO: this actually resolves a conflict that should be catched when adding?
+    // TODO: this actually resolves a conflict that should be caught when adding?
     m_maxSize = m_maxSize.expandedTo(m_minSize);
 
     // calculate this _once_ to get a common size.
@@ -294,7 +294,7 @@ void TabGroup::blockStateUpdates(bool more) {
     more ? ++m_stateUpdatesBlocked : --m_stateUpdatesBlocked;
     if (m_stateUpdatesBlocked < 0) {
         m_stateUpdatesBlocked = 0;
-        qWarning("TabGroup: Something is messed up with TabGroup::blockStateUpdates() invokation\nReleased more than blocked!");
+        qWarning("TabGroup: Something is messed up with TabGroup::blockStateUpdates() invocation\nReleased more than blocked!");
     }
 }