diff --git a/doc/guide/Guide_Introduction.ipynb b/doc/guide/Guide_Introduction.ipynb
index 94757ea4b..f5b65aab0 100644
--- a/doc/guide/Guide_Introduction.ipynb
+++ b/doc/guide/Guide_Introduction.ipynb
@@ -12,15 +12,13 @@
     "According to the IPCC [[1]](#1), natural risks emerge through the\n",
     "interplay of climate and weather-related hazards, the exposure of goods\n",
     "or people to this hazard, and the specific vulnerability of exposed\n",
-    "people, infrastructure and environment. In CLIMADA, vulnerability is\n", 
-    "operationalized through the use of impact functions, which are essential\n",
-    "in determining the extent to which exposure is affected by a given hazard.\n",
+    "people, infrastructure and environment. \n",
     "\n",
     "The unit of measurement for risk in CLIMADA is selected based on its relevance\n",
-    "to the specific decision-making context and is not limited to monetary units\n", 
-    "alone. For instance, wildfire risk may be quantified by the burned area\n", 
-    "(hazard) and the exposure could be measured by the population density or the\n", 
-    "replacement value of homes. Consequently, risk could be expressed in terms of\n", 
+    "to the specific decision-making context and is not limited to monetary units\n",
+    "alone. For instance, wildfire risk may be quantified by the burned area\n",
+    "(hazard) and the exposure could be measured by the population density or the\n",
+    "replacement value of homes. Consequently, risk could be expressed in terms of\n",
     "the number of people affected for evacuation planning, or the cost of repairs\n",
     "for property insurance purposes.\n",
     "\n",
@@ -41,13 +39,15 @@
     "\n",
     "where $f_{\\text{imp}}$ is the impact function which parametrizes to what extent\n",
     "an exposure will be affected by a specific hazard. **While the term 'vulnerability\n",
-    "function' is broadly used in the modelers community, we adopt the term\n",
-    "'impact function' to explicitly include the option of opportunities\n",
-    "(i.e. negative damages)**. Using this approach, CLIMADA constitutes a\n",
-    "platform to analyse risks of different hazard types in a globally\n",
-    "consistent fashion at different resolution levels, at scales from\n",
-    "multiple kilometres down to meters, tailored to the specific requirements of\n", 
-    "the analysis.\n",
+    "function' is broadly used in the modelers community, we adopt the broader term \n",
+    "'impact function'. Impact functions can be vulnerability functions or structural \n",
+    "damage functions, but could also be productivity functions or warning levels. This \n",
+    "definition also explicitly includes the option of opportunities (i.e. negative damages).**\n",
+    "\n",
+    "Using this approach, CLIMADA constitutes a platform to analyse risks of different\n",
+    "hazard types in a globally consistent fashion at different resolution levels, \n",
+    "at scales from multiple kilometres down to meters, tailored to the specific \n",
+    "requirements of the analysis.\n",
     "\n",
     "\n",
     "<br/><br/>\n",